Theoretically, when flattened to the same thickness, thin flattened heat pipes made from thin-walled cylindrical heat pipes with larger diameters have better thermal performance, but the conventional wick structures cannot meet their high-performance thermal requirements. In this study, to improve the heat transfer performance of large-diameter thin flattened heat pipes, composite sintered wick structures with spiral woven mesh and different mesh sizes of orthogonal woven mesh were designed and fabricated. The sizes were 150, 200, and 250 mesh. Four types of wick structures were developed to investigated the effects of the weaving mesh size and the composite sintering of the orthogonal woven mesh on heat transfer performance. The results demonstrated that the sample with the 200-mesh orthogonal woven mesh sintered wick exhibited the most pronounced improvement in thermal performance. The maximum heat transport capacity of the sample was found to be 46 W, representing an increase of 91.67 % compared with the sample utilizing the spiral woven mesh wick. Additionally, the evaporation resistance decreased by 56.24 %, and the total thermal resistance decreased by 53.40 %. These findings are highly conducive to the economic fabrication and performance improvement of large-diameter thin flattened heat pipes.

中文翻译：

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提高大直径薄型扁平热管传热性能的实验研究


理论上，当扁平化至相同厚度时，由较大直径的薄壁圆柱形热管制成的薄扁平化热管具有更好的热性能，但传统的毛细结构无法满足其高性能热要求。在本研究中，为了提高大直径薄型扁平热管的传热性能，设计并制造了具有螺旋编织网和不同网孔尺寸的正交编织网的复合烧结芯结构。尺寸为 150、200 和 250 目。开发了四种类型的芯结构来研究编织网尺寸和正交编织网的复合烧结对传热性能的影响。结果表明，采用200目正交编织网烧结芯的样品在热性能方面表现出最明显的改善。该样品的最大传热能力为46 W，与采用螺旋编织网芯的样品相比增加了91.67%。此外，蒸发热阻降低了56.24%，总热阻降低了53.40%。这些发现非常有利于大直径薄型扁平热管的经济制造和性能提高。